echo ' <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar-collapse-elements">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>';
echo ' <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar-collapse-elements">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>';